Taper-gear-hobbing machine



1925 4 Sheets-Shes*v l E. A. NOLL TAPER GEAR HOBBING MACHINE Filed Dec. '7.

gnou/folla Dec. 28 1926.

Uec.. 28 1926.

E. A. NOLL TAPER GEAR HOBBINGMACHINE 4 Sheetss-Sheet 9 Filed Deo. v. 1923 @WMZ E. A. NOLL I TAPER GEAR HOBBNG MACHINE .Deco 28 1926.

FiledDec. 7. 1923 4'Sheets-Sheet 3 Dec. 28 1926. LZZ' E. A. NOLL TAPER GEAR HOBBING MACHINE Filed Deo. '7. 1923 4 Sheets-Sheet .L

gva/UMNO@ Wt M Patented Der. 28, i926.,

unirse stares EDWLHD A. NOEL, 0F LAKEWUOD, OHIO.

TPEltt-@EARHOBBING MACHINE.

Application tiled, December T, 1923. Serial No. 679,129.

My invention relates to a taper gear hob- 'hing machine for generating tapered gears, cutters or other articles resembling gears upon the principle of the Simmons'method and is designed particularly to provide a simple and compact mechanism tor effecting the desired relative movements between the rotating blank and bobbing cutter. In forming tapered gears by the Simmons method, a hob or bobbing cutter Whose teeth are 'helicallv disposed is continuously rotated in intermeshing cutting engagement `with a rotating blank. Either thecutter or the blank may have a `feed movement in the direction longitudinally of the axis oit the blank and at the same time the axes of the blank and the cutter `are slowly brought together to produce the deand the like.

The presentinvention has .tor its object to provide simple mechanism 'For causing an accuratelv predetermined bodily movement of the blank relatively-to the axis of the cutter during the traverse ot' 'the blank by the cutter.

Reference should be had to the accompanying drawings forming a part of this specification in which Fig. 1 is a side elevation ot a bobbing machine embodying my invention; Fig. 2 is a top plan view oft the bobbing machine: Fig. 3-is a section on line 3-3 ot Fig. 1; Fig. 4 is a section on line 4`4 ot Fig; 1: Fig. 5 is a vertical central section through the angularlv adjustable cutting supporting member: Fig. 6 is a detail view showing 'the bobbing cutter and blanknear the end of the cutting operation; Fig. 7 is a detail view showing the hobbing cutter in side elevation; Fig. 8 is a diagrammatic viewvshovving a part of the gearj ing through which the cutter is driven.

The accompanying drawings show the invention applied to a bobbing machine of well 5 known make (a Barber fGoleman machine)v and this machine is therefore illustrated and described herein only in so faras it is neefessary to give a complete understanding of the present invention.

Referring to the accompanying drawings, thehobbing machine is mounted upon a suitable stand provided with a longitudinally extending bed-1 upon which the cutter carriage .2 travels. the carriage 2 being moved back and torth along the bed by means ot means of bolts' 7 which sired taper teeth on spur and helical gears' a lead screw 3.- The carriage 2 has mounted thereon an angularly adjustable support 4 for the cutter, the support 4 being provided With an annular rib 5 on its under face which engages in an annular T-slot 6 in the carriage 2 andthe support 4 is held in adjusted position upon the carriage 2 by extend through the adjustable support and have their heads located within the tEF-slot 6. At their upper ends .the bolts 7 are engaged by nuts 7a by means of which the support may be clamped to the carriage or loosened sutliciently to permit angular movement `When it is desired to -adjust the support upon Ithe carriage. Mounted upon the angularly adjustable support 4 is a transversely` adjustable carriage 8 for the hob spindle.

At the rear end ot the longitudinally eX- tending bed 1 there is avertical guide channel 9 which extends up from the bed. Slid-V ably mounted in the guide channel 9 .is a Work spindle carriage 10 through which extends a vertically disposed nonrotatable screw 11. The carriage 10 carries a Worm wheel nut 12 which engages the nonrotatable screw 11 and is adapted to be rotated by means ot' a worm 13 in engagement therewith, the Worm 13 being carried by a vvorm shaft 14 Which extends to the outside of the carriage 10. At its outer end the l.Worm shaft 14 is provided with an indicating dial 15 by means of which the adjustment of the carriage may be accurately indicated, the outer end of the shaft 14 being squared 'for engagement with a detachable actuating crank.

'Adjacent the rear end of the machine there is a transverse -drive shaftcarrying ii'xed and loose pulley wheels 16 and 17 adapted to receive the power belt. The drive shaft extends through the supporting stand into a gear casing 18 upon the opposite side of the machine and through gearing in said casing and in the interior or the stand drives a cutter driving shaft 19 which extends longitudinally beneath the bed and a lead screw driving shaft Q0 which extends along one side ot the supporting frame. The driving shaft also drives a vertical 'Work spindle drive shaft 21 which is carried by the gear casing 22st the rear end of the work spindle carrying carriage 10, the shaft 21 being driven through a beveled. gear splined thereon. The vertical .shaft 21 has im a Worm 23 thereon which meshes With a Worm Wheel 24 on the -vvorl; spindle Within the easing 22.

For driving the cutter the shaft 19 has a bevel gear 25 slidably splined thereon and meshing With a bevel gear 26 on a vertical shaft 27 which is disposed at the pivotal axis ofthe angularly adjustable cutter support 4. 'lhe shaft 27 is connected by spur and bevel gears in the gear casing 28 to a horizontal shaft 29 which projects beyond the end of the cutter carriage 2 and carries a ily Wheel 30, the shaft 27 having a spur gear 27a at its upper end which meshes `with a spur gear 27h which meshes with a spur gear 27c on a vertical shaft 27d.' which carries a bevel gear 27e which meshes with -a bevel` gear 29 on the shaft 29. .The cutter spindle v31 is driven through spur gears Within the gear casing 33, the spur gears being in sliding mesh to permit adjustment of the carriage 8 upon' Which the cutter spindle is mounted.

At the forward end of the machine the transverse shaft 34 is driven through bevel gearing from `the longitudinal extending shaft 20. 0n the side of the machine opposite that upon which the shaft 2O is mounted there is a gear casing 35 into which the shaft 34 extends and in which is located gearing through which the shatt'34 drives a countershaft 36 mounted in fixed bearings. Pivotally mounted on the countershaft 36 are rocker arms 38 which carry a worm shaft 39 which is adjustable angularly about the j* shat 36 by means of the rocker arms 38 and which is constantly driven from the shaft 36 through spur gears. The shaft 39 carries a Worm 40 which is adapted to mesh With a worm Wheel 41 fixed to the lead screw 3. ln the upper portion of the gear casing 35 there is pivotally mounted a hand lever 42 which is connected by adink 43 to a bell crank extension 44 of one of the arms 38 supporting the worm shaft 39. By rocking the hand lever 42, the worm 40 may be moved into and out of mesh with the Worm Wheel 41 on vthe lead screw 3. When the Worm 40 is in mesh with the worin wheel 41 the lead screw is constantly driven at a rate bearing a predetermined ratio to the rate of rotation of the drive shaft. Whenever the hand lever 42 is actuated to disengage the Worm 20, the rotation of the lead screw 3 is stopped'. A rod 45 `is pivotally connected to the lever 42 and slidably mounted on alug 46 on the underside of the carriage 2. At the rear of the lug 46 the rod 45' is provided with an adjustable nut 47. The rod 45 provides means for automatically disconnecting the lead screw when the carriage has reached a predetermined point in its movement.` When the carriage has reached'this point the lug 46 comes into engagement With the nut 47, thereby shifting the lever 42 to disengage neiaoea vides an additional movement for the Worlr spindle supporting carriage as Willnovv be described.

ln hobbing machines as heretofore constructed the vertical screw 11 has been fined at its lower. end to the bed. ln the present invention the'scrtvv 11 is fixed at its lower end to a support 50 which is slidable vertically in the channel guide 9. rlhe support 50 has an integral ll-shaped extension 51 which lits in a vertical l-groove in one Wall of the channel 9 and a detachably connected V-extension 52 on the opposite side which tits in a similar V-groove in the opposite Wall of the channel. rlhe support 50 has integral outwardly extending arms 53 through one of which extends a tap bolt 54 for securing the detachable extension 52 in place. The outwardly extending arms 53 have a toot plate 55 integral therewith and outside the channel 9. lo the underside of the foot plate55 is a Wedge shoe 56 which is secured to the foot plate 55 by means of an attaching bolt 57. @n the bed of the machine directly lbeneath the wedge shoe 56 there is lined a.

vhas a close lit in the tube 609 being held against movement with respect to the tube 60 by means of a set screw 62 atthe rear end of the tube 60.

ln' operation of the machine the work spindle and cutter spindle are continuously rotated and the carriage 2 is slowly ted rearwardly by the lead screw 3 so that the hobbing cutter is gradually moved across the blank during the cutting operation. Assuming that the blank has been properly positioned with respect to thecutter. a gear or similar article with teeth of the desired height will have been cut by the cutter during its movement across the periphery of the blank. ln accordance with the present invention the rearward movement of the car- .riage 2 causes acorresponding rearward movement of the wedge 59 and a lowering of the work spindle at a rate in an exact ratio to the movement of the carriage. This lowering of the work spindle causes the periphery of the cutter to approach the axis of the blank during thecutting operation so that the cutter. generates a taper gear as distinguished from the spur gear ordinarily produced by such machines. v The wedge shoe 56 and wedge 59 arc readily detachable and may be replaced by wed es having a diilerent inclination for` pro ucing a less taper in the gear being cut.

Having described myinvention, I claim:

1. Ina machine of the character described, a supporting frame, two supports mounted on said frame forlinear movements, the

path of movement of one support being an-` gularly disposed with respect to the path of movement ofthe other support, means on one support for rotatably supporting a blank, a hobbing cutter on the other-support, means for driving the'cutter and blank, means actuated by the driving means for moving one of the supports, and a wedge movable with the support somoved and engaging with the other support to simultaneously` move the same.

2. In a machine of the character described, a supporting frame, a support mounted for horizontal movement on the frame, a support mounted for vertical movement 'on the frame,

" a spindle adjustably mounted on each of said supports, one spindlejadapted to carry a tool Y greater or and the other a blank, means for driving said l splndles, means actuated by the driving means for shifting said first mentioned support horizontally, and a wedge member upon which the vertically movable support rests, said wedge member being movable with the horizontally movable support.

3. In a machine of the-character described, a supporting frame, having a vertical guide portion and a horizontal bed, a support mounted for vertical movement in the vertical guide portion, a vertical screw carried by said support, a head supported by the screw and having a nut in engagement with the screw whereby the head may be moved along the screw, a spindle projecting laterally from the head, said support having a supporting portion provided with an inclined under face, a wedge member slidablv mounted on the bed and having an inclined top face'upon which the inclined under face of the supporting portion ofthe vertically movable support bears, a support movable horizontally on the bed toward and from the vertically movable support, a spindle on said horizontally movable support, one of said spindles adapted to 'support a blank and the other a tool, andnieans for driving said spindles and for moving said horizontally movable support along the bed, said wedge member being movable with the horizontally movable support and adjustably connected thereto.

In testimony whereof, I hereunto atiix myv EDWARD A. NoLL.

signature. 

